Size Chart
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ACL 4M2633HX-STD is a main bearing set for the cataloged Nissan VQ20DE, VQ25DE, VQ25DET, VQ30DE engine configurations. STD manufacturer size designation; verify the exact engine and assembled clearance.
HX specifies 0.001 inch (0.025 mm) additional oil clearance relative to the corresponding H-STD set on the specified standard-size shaft. It is separate from any repair-size or housing-oversize designation.
ACL’s 2023 guide lists 4M2633 main bearings for VQ20DE, VQ25DE, VQ30DE, VQ30DET and VQ35DE. The associated rod families differ: 6B2630 for the listed 2.0L/2.5L/3.0L applications with a 48 mm rod tunnel, and 6B2640 for VQ35DE. VQ35HR, VQ37VHR and VR30DDTT instead use 1M2505 graded or 4M2505 main bearings; a shared VQ name does not establish interchangeability.
| Manufacturer / Engine | Nissan — VQ20DE |
|---|---|
| Manufacturer / Engine | Nissan — VQ25DE |
| Manufacturer / Engine | Nissan — VQ25DET |
| Manufacturer / Engine | Nissan — VQ30DE |
| Manufacturer / Engine | Nissan — VQ30DET |
| Manufacturer / Engine | Nissan — VQ35DE |
The engine-family list identifies catalog applications, not universal vehicle fitment. Confirm the exact engine version, crankshaft, rods, block and bearing location. Vehicle names and photos do not replace dimensional verification.
| Brand | ACL |
|---|---|
| Manufacturer Part Number | 4M2633HX-STD |
| Component | Main Bearing Set |
| Size Selection | STD manufacturer size designation; verify the exact engine and assembled clearance. |
| Catalog Main Housing Bore (STD journal) | 63.993–64.017 mm |
| Catalog Main Journal Diameter (STD) | 59.951–59.975 mm |
| Catalog Family | ACL Race Series |
| Half Type | Upper & lower |
| Catalog Size Options | STD |
Confirm the set contents, bearing positions and any separate thrust components against the complete manufacturer number. The photo is representative of the part family.
Measure shaft journals, housing bores and assembled oil clearance using the engine builder’s specification. Check oil-hole alignment, groove placement and crankshaft fillet clearance before final assembly. Catalog standard dimensions must not be treated as the finished dimensions for a different repair size. ACL specifies that abrasive pads or paper must not be used on the bearing surface to alter oil clearance.
Is the year and model enough to choose this bearing? No. Match 4M2633HX-STD to the exact engine and measured build specification.
What size is this listing? STD manufacturer size designation; verify the exact engine and assembled clearance.
Can I substitute a different suffix? Compare the complete grade, size, locating features and assembled clearance before substituting any bearing.
For the VQ35DE application, see ACL 6B2640HX-STD rod bearings. This is a separately sold component with its own measured journal clearance; confirm the exact engine code and size before pairing parts.
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